Thanks everyone for their kind comments. This is my second try at blackies. hopefully they do well.
I have had rays with my polypterus before, so far I nv had any problems. Hopefully with constant feeding, they won't bite my rays. But so far my polypterus are very well behaved. I even mix a 6" del in there with np. now that del is 9".
Sweet rays. Ya I also have 3 decent size large bichirs ranging from 14"-18" with my 2 rays. Male ray being the smaller one at 9" and female about 13". My bichirs don't even bother them.